The bottom knife is either a 970 or a 975 (the Benchmade rendition of the Emerson CQC7), depending on its size (the 970 has a 3.25" blade; the 975 is around 3.9").
I would say that the middle knife is either a 970S or a 970S, depending on its size, but the lack of any Emerson markings on the back side of the blade -- and the weirdly low grind that goes straight all the way back to the scale instead of dipping downward just before -- make me suspicious of its authenticity. Can't rule out that Benchmade did in fact make a 970 with that grind shape (possibly as a prototype?), but I would seek out a more expert opinion to make sure that it's the real thing.
Benchmade started making the 970 around 1994 and ceased production in 1999, so authentic 970s will date from sometime in that period.